This issue has already been discussed. But without a solution. Anybody
knows now whether there is a solution.
If I stop Cluster service with rcnovell-uldncs then it hangs at "Please
wait for the Novell Cluster Services KOs to unload".

At the moment, I remarked "modprobe -r cma cmsg crm cvb css vipx sbd gipc
vll sbdlib clstrlib" in uldncs and I can shutdown server without power
button. But if want to restart cluster services, it is impossible.

Any idea?